RU2371526C1 - Method of receiving of thin-filament cellulose filament - Google Patents

Abstract

FIELD: textile, paper.

SUBSTANCE: method is provided for receiving of cellulose filament, consisting of ultrafine filaments and used at manufacturing of filter fabric for filtration of blood and its components against white blood cells. According to the method it is implemented extrusion of spinning solution, stretch extraction of nascent yarn, post reduction, washing, drying and acceptance of filament. Extrusion is implemented at effluence rate of spinning solution 14.1 ÷ 19.0 m/min and extrusion 7.4 ÷ 39.0 % with receiving of filament, consisting of ultrafine filaments of linear density less than 0.039 tex. Squeezed after washing filaments with zero twist are formed into total tow of linear density 5.5 ÷ 7.2 ktex, it is dried up to humidity 20 ÷ 50% and is accepted in the form of flat tape into receiver tank. In the implementation version squeezed after washing single parallel oriented with zero twist are dried up to humidity 6 ÷ 19 %, it is formed into total tow of linear density 5.5 ÷ 7.2 ktex, it is embossed and accepted in the form of three-dimensional tow. Washing of filaments is implemented by countercurrent in three stages by soften water.

EFFECT: obtaining filament of linear density less than 0,039 tex, which can be used for formation of filter fabric with high performance attributes, providing increased effectiveness of blood cleaning up to 99,7%, and absence of filament twist provides simplification of its processing at manufacturing of filter fabric.

4 cl, 3 ex, 1 tbl

Description

The invention relates to a technology for producing chemical threads, in particular to the production of cellulose complex filaments, consisting of ultrafine filaments, and can be used in the manufacture of filter material for filtering blood and its components from white blood cells.

A known method of producing hydrated cellulose filament with a linear density of filaments of the order of 0.067 tex by molding viscose with a ratio of mass fractions of caustic soda and α-cellulose 0.85-0.95 in concentrated sulfuric acid (Z. A. Rogovin "Fundamentals of chemistry and technology of chemical fibers ", Publishing house" Chemistry ", Moscow, 1964).

This method has a number of technical and technological difficulties due to the use of concentrated sulfuric acid, which makes it unacceptable for production.

A known method of producing cellulose yarn in the manufacture of viscose cord (A.A. Konkin and others. "Production of tire cord", publishing house "Chemistry", Moscow-Leningrad, 1964, p. 257-291), in which the molding is carried out in horizontal a tube that minimizes the hydrodynamic resistance of the precipitation bath. A freshly formed thread emerging from a precipitation bath enters an orientational (plasticizing) drawing in a solution of sulfuric acid. After plasticization drawing, the thread is subjected to additional reduction in a solution of sulfuric acid, then two-stage washing and avivazhnoe processing. Next, the thread enters the paired heated cylinders for drying. The thread, dried up to (8-10)% moisture, is fed to the receiving mechanism - ring-twisting spindles, where it is received on two-flange coils. On the ring-twist mechanism, the threads report twist (60-75) cr / m.

This method does not allow to obtain a thread with ultrafine filaments and a linear density of less than 0.039 tex.

The closest in purpose and essential features to the present invention is a method for producing a fine filament cellulose filament, consisting of filaments, the linear density of which is less than 0.05 tex, in which the dope at a flow rate of (10.5-11.5) m / min and spunbond (40-70)% is formed into a horizontal spinning tube to obtain a multifilament yarn consisting of filaments of linear density less than 0.05 tex. The freshly formed yarn is subjected to orientational drawing in a plasticizing bath in a solution of sulfuric acid. After plasticization drawing, the thread is subjected to additional reduction in a solution of sulfuric acid and a four-stage washing with softened water. The shrinkage of the thread after washing is (0-3)%. After washing, the thread enters the paired heated cylinders, where it is dried. The dried thread enters the receiving mechanism - ring-twisting spindles, where it is given a twist (40-50) cr / m (see RF patent No. 2283375, IPC D01D 5/06, 09/10/2006).

The implementation of this method allows to obtain a twisted multifilament yarn consisting of filaments with a linear density of from 0.039 to 0.05 tex.

The obtained thread is suitable for use in the production of filter material for filtering blood and its components from leukocytes, however, it has several disadvantages: the fineness of the filaments, its constituents, does not allow to obtain filter material from it with high performance properties.

In addition, the compactness of the thread, acquired during the twisting process, complicates the processing of the latter in the manufacture of filter material.

The technical result from the use of the invention is to obtain a fine filament cellulose complex filaments, consisting of filaments with a linear density of less than 0.039 tex.

This technical result is achieved by two variants of the method for producing a thin filament cellulose yarn, including spinning dope molding, plasticizing stretch of a freshly formed yarn, additional restoration, washing, drying and acceptance of the yarn.

According to the first embodiment, the molding is carried out at the end of the spinning solution at a speed of (14.1-19.0) m / min and a die drawing (7.4-39.0)% to obtain a yarn consisting of ultra-thin filaments with a linear density of less than 0.039 tex wherein the zero twist filaments pressed after washing form a ctex into a total linear density bundle (5.5-7.2) ctex, dry it to a moisture content of (20-50)% and take it in the form of a flat ribbon in a receiving container.

Washing the threads is carried out countercurrent in three stages with softened water.

According to the second embodiment, the spinning is carried out when the spinning solution expires at a speed of (14.1-19.0) m / min and a die drawing (7.4-39.0)% to obtain a yarn consisting of ultra-thin filaments with a linear density of less than 0.039 tex wherein, single parallel-oriented filaments with zero twist wrung out after washing are dried to a moisture content of (6-19)%, form a ctex into a general bundle of linear density (5.5-7.2), corrugate it and take it in the form of a three-dimensional bundle.

Washing the threads is carried out countercurrent in three stages with softened water. The formation of a tow of linear density (5.5-7.2) ctex of threads with zero twist and humidity (6-19)%, its corrugation and reception is carried out using a corrugating machine MG-1.

Due to the combination of the proposed spinning solution flow rates and spunbond drawing, it became possible to obtain a cellulose hydrated multifilament yarn consisting of filaments with a linear density of less than 0.039 tex. The fineness of filaments provides high filtering properties of the filter material. The three-stage washing with countercurrent softened water ensures the purity of the thread in accordance with the sanitary and hygienic requirements for medical threads, allowing it to be used in the production of filter material for filtering blood and its components from white blood cells; zero twist of the obtained thread facilitates its processing in the manufacture of filter material, and drying to a moisture content of (6-19)% and (20-50)% ensures stable acceptance at receiving devices. When the tow moisture is more than 50%, the tow sticks on the surface of the squeeze rollers; when the tow moisture is less than 6%, windings are formed on the feed rollers of the MG-1 corrugating machine, which destabilizes the reception process.

The invention is illustrated by the following examples.

Example 1

The thin-filament cellulose yarn is formed on the AVK-06IM aggregate through a die 2950 / 0.037 with a spinning solution flow rate of 14.1 m / min and a die draw of 39%. The molding is carried out in a horizontal spinning tube. Freshly formed thread is subjected to plasticization drawing at a temperature of 98 ° C. Plasticizing hood is (80-85)%. After plasticization drawing, the thread is subjected to additional restoration, washing by countercurrent in three stages with softened water, and squeezing on squeezing rollers. Shrinkage of the thread at the stages of pre-restoration - washing is 3.7%.

After spinning, a common tourniquet of linear density (5.5-7.2) ctex is formed from the threads, it is dried to a moisture content of (20-50)% on a pair of heated cylinders and a wet tow is taken with the help of pulling rollers in the form of a flat tape in a receiving container ( pelvis).

The resulting bundle consists of complex untwisted filaments (with zero twist) of a linear density of 113 tex. The linear density of ultrathin filaments (filaments) is 0.038 tex, the transverse size is (5.5-6.5) microns. The linear density of ultrafine filaments was calculated based on the results of microscopic studies of cross sections.

Filtering material for the purification of blood and its components from leukocytes based on thin filament cellulose filaments is made by paper technology after crushing, crimping, drying and cutting a bundle of thin filament cellulose filaments into segments (3-5) mm.

The efficiency of purification of blood and its components from leukocytes when using filter material based on thin filament cellulose filament is 99.70%.

Example 2

The fine-filament cellulose yarn is obtained in accordance with Example 1 through a die 2950 / 0.032 with a spinning solution flow rate of 16.5 m / min and a die draw of 24.8%. Plasticizing hood is (70-75)%, thread shrinkage at the stages of pre-restoration - washing is 2.8%.

The resulting bundle consists of complex untwisted filaments (with zero twist) of a linear density of 110 tex. The linear density of ultrathin filaments (filaments) 0,037 tex.

The efficiency of purification of blood and its components from leukocytes when using filter material based on fine filament cellulose filament is 99.90%

Example 3

The fine filament cellulose yarn is obtained in accordance with Example 1 through a die 2950 / 0.030 at a spinning solution outflow rate of 19.0 m / min and a die draw of 7.4%. Shrinkage of the thread at the stages of pre-restoration - washing is 2.5%.

The tow of linear density (5.5-7.2) ctex is formed from single parallel oriented filaments with zero twist after drying to a moisture content of (6-19)% on a pair of heated cylinders.

The formation, corrugation and reception of a three-dimensional bundle is carried out using the MG-1 corrugating machine while synchronizing the molding speed on the AVK-06IM unit and the speed of receiving the harness on the MG-1 corrugating machine.

The resulting three-dimensional bundle consists of complex untwisted filaments of linear density 103 tex. The linear density of ultrathin filaments (filaments) 0,035 tex.

The efficiency of purification of blood and its components from leukocytes when using filter material based on thin filament cellulose filament is 99.95%.

Table Example Die The linear density of the multifilament yarn, tex Linear density of a filament, tex Spinning solution flow rate, m / min Spinning hood,% one 2950 / 0.037 113 0,038 14.1 39.0 2 2950 / 0,032 110 0,037 16.5 24.8 3 2950 / 0,030 103 0,035 19.0 7.4 prototype 2950 / 0,036 115 0,039 10.5 40,0

Claims (4)

1. A method of obtaining a fine filament cellulose yarn, including spinning dope molding, plasticizing stretching of a freshly formed yarn, additional recovery, washing, drying and yarn acceptance, characterized in that the molding is carried out at a spinning solution expiration speed of 14.1 ÷ 19.0 m / min and spunbond extract 7.4–39.0% to obtain a yarn consisting of ultrafine filaments with a linear density of less than 0.039 tex, and the filaments with zero twist wrung out after washing to form a 5.5–7.2.2 ktex linear density bundle, dried it to a moisture content of 20 ÷ 50% and is taken in the form of a flat tape in a receiving tank. 2. The method according to claim 1, characterized in that the washing of the threads is carried out countercurrent in three stages with softened water. 3. A method of producing a thin filament cellulose yarn, including spinning dope molding, plasticising stretching of a freshly formed yarn, additional recovery, washing, drying and yarn acceptance, characterized in that the spinning is carried out at a spinning solution flow rate of 14.1 ÷ 19.0 m / min and spunbond 7.4 ÷ 39.0% extract to obtain a yarn consisting of ultra-thin filaments of linear density less than 0.039 tex, while single parallel-oriented filaments with zero twisting wrung out after washing are dried to a moisture content of 6 ÷ 19%, form 5.5 ÷ 7.2 ktex into a general bundle of linear density, corrugate it and take it in the form of a three-dimensional bundle. 4. The method according to claim 3, characterized in that the washing of the threads is carried out countercurrent in three stages with softened water.